According to Manning's formula, the discharge through an open channel is (where M = Manning's constant)

A. $${\text{A}} \times {\text{M}} \times {{\text{m}}^{\frac{1}{2}}} \times {{\text{i}}^{\frac{2}{3}}}$$

B. $${\text{A}} \times {\text{M}} \times {{\text{m}}^{\frac{2}{3}}} \times {{\text{i}}^{\frac{1}{2}}}$$

C. $${{\text{A}}^{\frac{1}{2}}} \times {{\text{M}}^{\frac{2}{3}}} \times {\text{m}} \times {\text{i}}$$

D. $${{\text{A}}^{\frac{2}{3}}} \times {{\text{M}}^{\frac{1}{3}}} \times {\text{m}} \times {\text{i}}$$

Answer: Option B